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Streptavidin conjugated horseradish peroxidase

Manufactured by Zymo Research
Sourced in United States

Streptavidin-conjugated horseradish peroxidase is a detection reagent that combines the high-affinity binding of streptavidin to biotin with the enzymatic activity of horseradish peroxidase. This conjugate is commonly used in various immunoassay and detection techniques.

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4 protocols using streptavidin conjugated horseradish peroxidase

1

Immunohistochemical Staining Protocol

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Immunohistochemistry assay was performed as described by Xu. et al. [18 (link)]. In brief, serial cross sections of 4 μm thick were collected and stained immunohistochemically according to the manufacturer's instructions. The samples were deparaffinized, rehydrated, and incubated with fresh 0.3% hydrogen peroxide in methanol for 10 min at 37°C. The sections were then autoclaved for antigen retrieval in citrate buffer at 100°C for 5 min and incubated with indicated antibodies overnight at 4°C. The sections were washed with phosphate-buffered saline (PBS) and incubated with biotinylated anti-rabbit IgG as a secondary antibody for 15 min at 37°C and then with streptavidin-conjugated horseradish peroxidase for 15 min at 37°C (Zymed, Carlsbad, USA). The immune reaction was demonstrated using DAB, and the sections were counterstained with hematoxylin, dehydrated, and then mounted.
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2

Immunohistochemical Analysis of LXRα in Oral Cancer

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Serial cross sections, 4 μm thick, were collected and stained immunohistochemically as per manufacturer's instructions for the Histostain®-Plus kits (Zymed, Carlsbad, USA). The samples were deparaffinized, rehydrated, and incubated with fresh 0.3% hydrogen peroxide in methanol for 10 min at 37 °C. Sections were autoclaved for antigen retrieval in citrate buffer at 100 °C for 2 min and incubated with rabbit LXRα polyclonal antibody (ab41902, dilution 1:1000, Abcam, USA) at 4 °C overnight. Sections were washed with PBS and incubated with biotinylated anti-rabbit IgG as a second antibody for 15 min at 37 °C and then with streptavidin-conjugated horseradish peroxidase for 15 min at 37 °C (Zymed, Carlsbad, USA). An immune reaction was demonstrated with DAB. The sections were counterstained with hematoxylin, dehydrated, and mounted. PBS substituted for primary antibody in negative controls, with no evident detectable staining. LXRα -positive oral cancer was a positive control in this study.
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3

Immunohistochemical Localization of UBE3B

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Frozen tissue blocks were sectioned at 20 μm, mounted on gelatin-subbed slides, and post-fixed in 4% paraformaldehyde for 20 minutes at room temperature. Sections were then incubated in endogenous enzyme block (1% H2O2, 10% MeOH) for 15 minutes and, additionally, blocked using 2% bovine serum albumin (BSA) in 10 % goat serum (Life Technologies, 16210-072, Grand Island, NY) at room temperature for 1 hour, followed by incubation in an anti-UBE3B (1:100, Novus Biologicals, NBP1-92559, Littleton, CO) antibody produced in rabbit (Sigma-Aldrich, St. Louis, MO) at 4°C overnight. The specificity of this antibody has been validated by protein array, Western blot and antigen preabsorption. Sections were then incubated at room temperature in biotinylated anti-rabbit IgG antibody produced in goat (1:500, Vector Labs, Burlingame, CA), followed by a 2-hour incubation in horseradish peroxidase-conjugated streptavidin (1:5,000, Zymed, San Francisco, CA) made in 0.1 Mol/L of phosphate buffer (PB) at room temperature, and finally in diaminobenzidine/peroxidase reaction (0.02% diaminobenzidine, 0.08% nickel-sulphate, 0.006% hydrogen peroxide in 1 Mol/L PB) before they were dehydrated and coverslipped.
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4

Spleen Analysis of Sca1-Bcl6 Mice

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Sheep red blood cells (1–2 × 108 cells) were injected into the peritoneum of control, Sca1-Bcl6floxed mice and Sca1-Bcl6Δ mice. Ten days later, the spleens were analyzed by immunohistochemistry. The spleens of control, Sca1-Bcl6floxed mice and Sca1-Bcl6Δ mice were isolated, embedded in OCT compound (Sakura) and snap-frozen on dry ice. Cryosections of the spleen were stained with a FITC–anti-IgD antibody (1:100 dilution, BD Biosciences) and biotinylated PNA (1:100 dilution, clone B-1075, Vector Laboratories). FITC–anti-IgD was detected with an alkaline-phosphatase-coupled anti-FITC antibody (Roche), which was visualized by incubation with Fast Red (Sigma). biotinylated PNA was detected with horseradish peroxidase-conjugated streptavidin (Zymed) followed by incubation with diaminobenzidine (DAB; Sigma).
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